CVE-2026-12610
published 2026-06-30CVE-2026-12610: A flaw was found in sssd. When authenticating with a YubiKey, the SSSD PAM responder can crash due to a use-after-free vulnerability, where a memory pointer is…
PriorityP431medium6.4CVSS 3.1
AVLACHPRHUINSUCHIHAH
EPSS
0.12%
2.3th percentile
A flaw was found in sssd. When authenticating with a YubiKey, the SSSD PAM responder can crash due to a use-after-free vulnerability, where a memory pointer is incorrectly handled. A local attacker could exploit this flaw by manipulating smartcard or YubiKey contents, leading to a denial of service that disrupts authentication. This vulnerability also presents a potential for privilege escalation, although it is difficult to exploit.
Affected
5 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| fedoraproject | sssd | — | — |
| pam | pam | — | — |
| redhat | enterprise_linux | — | — |
| redhat | enterprise_linux | — | — |
| redhat | enterprise_linux | — | — |
CVSS provenance
nvdv3.16.4MEDIUMCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
vendor_redhat6.4MEDIUM
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GHSA
A flaw was found in sssd.
ghsa_unreviewed·2026-06-30
CVE-2026-12610 [MEDIUM] CWE-825 A flaw was found in sssd.
A flaw was found in sssd. When authenticating with a YubiKey, the SSSD PAM responder can crash due to a use-after-free vulnerability, where a memory pointer is incorrectly handled. A local attacker could exploit this flaw by manipulating smartcard or YubiKey contents, leading to a denial of service that disrupts authentication. This vulnerability also presents a potential for privilege escalation, although it is difficult to exploit.
VulDB
sssd expired pointer dereference (ID 8796 / EUVD-2026-40268)
vuldb·2026-06-30·CVSS 6.4
CVE-2026-12610 [MEDIUM] sssd expired pointer dereference (ID 8796 / EUVD-2026-40268)
A vulnerability, which was classified as problematic, was found in sssd. The impacted element is an unknown function. Such manipulation leads to expired pointer dereference.
This vulnerability is referenced as CVE-2026-12610. The attack can only be performed from a local environment. No exploit is available.
Red Hat
sssd: Use-after-free crash in SSSD' 'sssd_pam' process
vendor_redhat·2026-06-09·CVSS 6.4
CVE-2026-12610 [MEDIUM] CWE-825 sssd: Use-after-free crash in SSSD' 'sssd_pam' process
sssd: Use-after-free crash in SSSD' 'sssd_pam' process
A flaw was found in sssd. When authenticating with a YubiKey, the SSSD PAM responder can crash due to a use-after-free vulnerability, where a memory pointer is incorrectly handled. A local attacker could exploit this flaw by manipulating smartcard or YubiKey contents, leading to a denial of service that disrupts authentication. This vulnerability also presents a potential for privilege escalation, although it is difficult to exploit.
Statement: This Moderate impact use-after-free flaw in the SSSD PAM responder can lead to a denial of service during YubiKey authentication, causing the process to crash and disrupt user access. While there is a theoretical potential for privilege escalation, exploitation is considered difficult due to t
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-12610 pam: Use-after-free crash in SSSD' 'sssd_pam' process [fedora-all]
bugzilla·2026-06-30·CVSS 6.4
CVE-2026-12610 [MEDIUM] CVE-2026-12610 pam: Use-after-free crash in SSSD' 'sssd_pam' process [fedora-all]
CVE-2026-12610 pam: Use-after-free crash in SSSD' 'sssd_pam' process [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
When authenticating with a YubiKey, the SSSD PAM responder crashes inside sss_certmap_match_cert because the sss_certmap_ctx pointer passed to it has already been freed and reused for string data from the p11_child response.
The pointer value 0x6e65687475412056 decodes to ASCII "V Auth en" which is part from the certificate label "X.509 Certificate for PIV Authentication" returned by p11_child. This confirms that the freed sss_certmap_ctx memory was reused during response parsing.
Root
Bugzilla
CVE-2026-12610 sssd: Use-after-free crash in SSSD' 'sssd_pam' process [fedora-all]
bugzilla·2026-06-30·CVSS 6.4
CVE-2026-12610 [MEDIUM] CVE-2026-12610 sssd: Use-after-free crash in SSSD' 'sssd_pam' process [fedora-all]
CVE-2026-12610 sssd: Use-after-free crash in SSSD' 'sssd_pam' process [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
When authenticating with a YubiKey, the SSSD PAM responder crashes inside sss_certmap_match_cert because the sss_certmap_ctx pointer passed to it has already been freed and reused for string data from the p11_child response.
The pointer value 0x6e65687475412056 decodes to ASCII "V Auth en" which is part from the certificate label "X.509 Certificate for PIV Authentication" returned by p11_child. This confirms that the freed sss_certmap_ctx memory was reused during response parsing.
Root
Bugzilla
CVE-2026-12610 sssd: Use-after-free crash in SSSD' 'sssd_pam' process
bugzilla·2026-06-18·CVSS 6.4
CVE-2026-12610 [MEDIUM] CVE-2026-12610 sssd: Use-after-free crash in SSSD' 'sssd_pam' process
CVE-2026-12610 sssd: Use-after-free crash in SSSD' 'sssd_pam' process
When authenticating with a YubiKey, the SSSD PAM responder crashes inside sss_certmap_match_cert because the sss_certmap_ctx pointer passed to it has already been freed and reused for string data from the p11_child response.
The pointer value 0x6e65687475412056 decodes to ASCII "V Auth en" which is part from the certificate label "X.509 Certificate for PIV Authentication" returned by p11_child. This confirms that the freed sss_certmap_ctx memory was reused during response parsing.
Root cause:
sss_certmap_ctx is owned by the PAM request state. If the request is cancelled or completes while the asynchronous p11_child process is still running, the request state (and the context) is freed. When the child eventually returns
2026-06-30
Published